This volume is the result of a symposium held in April 2018 focusing on parts of the early history of Swedish academic psychology as it evolved mainly from the middle of the 20th century. Two pioneers, Gösta Ekman at Stockholm University and Gunnar Johansson at Uppsala University, were highly influential in establishing the discipline of psychology in Sweden, and the texts of this volume represent developments which can be traced back to their work in the fields of perception and psychophysics. Following Ingemar Nilsson’s introductory presentation of Johansson and Ekman, their former students and collaborators describe how their early research experiences at Uppsala and Stockholm served as a platform for their own research work and future orientation. Claes von Hofsten, Sverker Runeson, Erland Svensson and Peter Juslin describe such a develop- ment originating at Uppsala and Yvonne Wærn, Ola Svenson, Tommy Gärling, Åke Hellström and Henry Montgomery the development originating in Stockholm. Their texts exemplify widely varying research specialities and applications, ranging from infants’ perception of movement, spa- tial perception of urban environments, risk perception, decision making in air pilot performance, human-computer interaction, and traffic and nuclear safety. Finally, Karl Halvor Teigen provides a neighbour’s commentary to the Swedish development.